Caustic Stress Cracking - ISBT Method
| Sample Type | Required Quantity | Equipment Used |
| Bottles |
30 | N2 tank and regulator Septum Closures |
Purpose
This procedure evaluates the performance of bottle bases when they
are exposed to a 0.2% solution of NaOH (Sodium Hydroxide) to simulate
the failure associated with Stress Cracking.
Description
Each bottle is filled to net target content with water equilibrated
to 22°C +/- 1°C (72 +/- 2°F). Bottles are pressurized with compressed
air to the equivalent internal pressure of 531 +/- 4 kilopasclals (77
+/-0.5 psi). After 5 minutes, the fill line on each of the bottles is
marked and they are placed in individual pockets of 0.2% Sodium
Hydroxide solution. The containers remain in the caustic solution until
they fail by either catastrophic burst or leaking through cracks that
develop in the base. The time to failure is recorded for each container.
Failed containers are removed and the location of the failure is
determined and recorded.
Video Demonstration
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